docs: def to_series(self, properties=None):
          """Return a pandas :class:`~pandas.Series` containing Compound data. Optionally specify a list of the desired
          properties.
  
          synonyms, aids and sids are not included unless explicitly specified using the properties parameter. This is
          because they each require an extra request.
          """
          import pandas as pd
          return pd.Series(self.to_dict(properties))